When Google updated its algorithm late last week to weed out low-quality content factories from the top of search results, the changes didn’t sit well with all.

Many well-known sites that pop up in search results despite having little good information, including Associated Content and Mahalo, were downgraded, according to an analysis by independent SEO software firm Sistrix.

But other content manufacturers weren’t. For instance, Demand Media, a content factory that churns out hundreds of web pages and videos daily, was hardly affected.